219=21-u

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Solution for 219=21-u equation: 



219=21-u

We move all terms to the left:

219-(21-u)=0

We add all the numbers together, and all the variables

-(-1u+21)+219=0

We get rid of parentheses

1u-21+219=0

We add all the numbers together, and all the variables

u+198=0

We move all terms containing u to the left, all other terms to the right

u=-198

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